Finding the Fourth Proportional to 2,111.83, 3,168.20 and 631.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.83 : 3,168.20 = 631.17 : x
2. Step 2: Convert to fraction form
   2,111.83/3,168.20 = 631.17/x
3. Step 3: Cross multiply
   2,111.83x = 3,168.20 × 631.17
4. Step 4: Simplify right side
   2,111.83x = 1,999,672.79
5. Step 5: Solve for x
   x = 1,999,672.79/2,111.83
6. Step 6: Final answer
   x = 946.89